Conductometric and Spectrophotometric Study of the Interaction of Methyl Violet with Sodium Dodecyl Sulfate
Khaled Edbey
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
Nabil Bader
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
Fateh B. Eltaboni *
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
Abdelqader Imragaa
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
Salah Albaba
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
Maher Ahmed
Department of Chemistry, Faculty of Science, University of Benghazi, Libya
*Author to whom correspondence should be addressed.
Abstract
The interactions of cationic dyes (methyl violet) with anionic surfactant sodium dodecyl sulfate (SDS) was studied in process of solubilization. The critical micelle concentration of the SDS with and without dye was determined by spectrophotometry and specific conductometry methods. The binding constant (Kb) and Gibbs free energy (∆Gͦ) were calculated at room temperature. Kb was calculated by means of Benesi-Hildebrand Equation. Results obtained showed that the Kb and ∆ Gͦ are found to be = 432.77 M-1 and -15.03 KJ mol-1, respectively. The value of ∆ Gͦ indicates that the interaction of methyl violet with micelles is spontaneous.
Keywords: Sodium dodecyl sulfate, CMC determination, methyl violet, dye-micelle interaction, binding constant, gibbs free energy, conductometry, spectrophotometry